13.1+2+3 Flashcards
What is the role of DNA in heredity
It’s role is to store genetic information. It packs info and passes it on to the next generation
What are DNA’s three functions
Storing, copying, and transmitting information
Long name for DNA
deoxyribonucleic acid
What is DNA
Two strains that coil in a double helix. Carry genetic instructions
Nucleotide
They are building blocks of nucleic acids. Individual unit
What are the three components of a single nucleotide
Deoxyribose(5-carbon sugar) phosphate group and nitrogen base
What is a nitrogen base
A molecule that contains nitrogen and has chemical properties of a base.
Four nitrogen bases
Adenine pairs with thymine, and guanine pairs with cytosine
What are purines and what are pyrimidines
Purines- two rings adenine and guanine. Pyrimidines- one ring cytosine and thymine
Nucleotides are joined together with a bond of which components of a nucleotide
Sugar and phosphate group
Chargaff’s rule
A=T, G=C
What holds strands of DNA together
Hydrogen bonds
Why are the strands considered complementary
Each strand can be used to make the other
Replication
Process of copying dna prior to cell division
When does the DNA cell get replicated
During the S phase of the cell cycle
